Which summary best explains the mechanisms that control the cell cycle in multicellular
organisms?
the type of dna in each cell controls the rate of the cell cycle and the specific type of cells
formed
the size of the cell determines the number of cells that will be produced from each cycle.
internal and external signals regulate the progression of the cell cycle at various critical
checkpoints
hormones signal the start of the cell cycle, and dna determines how the cell differentiates.

The correct answer is internal and external signals regulate the progression of the cell cycle at various critical check points.

Explanation:

The cyclic event that helps to prepare the cell for division is termed as cell cycle.Cell cycle are regulated by various internal and external factors which regulates the passage of cell through various critical check point.

 For example Maturation promoting factor helps in the progression of frog egg oocytes cells from G2 to M phase.

    G1 cyclin CDK helps in the passage of cell from G1 to S phase.

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation:

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.